function f(n) {
   var Olist=document.getElementById("logo-list").getElementsByTagName("li");
   var Odiv=document.getElementById("logo-content").getElementsByTagName("div")
   for(var i=0;i<Olist.length;i++)
   {
   	   if(i==n)Odiv[i].style.display="block";
          else Odiv[i].style.display="none";
   }

}
  function play(n){
  document.getElementById('audio1').src="mymusic/"+n+".mp3"; //n为变量，用“”括起来就成了字符串，读取内容；
  document.getElementById('audio1').autoplay="autoplay";
  }